Theoretical physics questions answered Essay Example | Topics and Well Written Essays - 3750 words

Theoretical physics questions answered - Essay Example (see answer-3) The remaining questions are about the rest of the paper, it would be sufficient for me if you could quote a book and chapter where I could find an answer to the respective question: -page 5: what do you mean by "carry no energy or momentum however ha energy-momentum" This means that massless particles are meaningless in Newtonian mechanics because they carry no energy or momentum and cannot sustain any force. Now, the relativistic expression for energy and momentum which is: however allows for non-zero energy-momentum for a massless particle when and this requires |v| 1. Furthur, in order to relate the energy E and momentum p we can assume that the relation p2 = m2 is valid for m = 0, and so, a massless particle's energy E and momentum p are related by E = |p|. page 7: I do not understand the sentence: "mediator has to be given on-zero spin" This actually wants to say that in order to accommodate the observed properties of the long-range electromagnetic and gravitational interactions, we also need to give the mediator a on-zero spin. However, this is non-trivial. _ page 8: why does the P operator transform under the fundamental This is an intrinsic requirement in any space-time study dealing with real vector spaces. Here 'P' is the orthogonal parameter that is subject to fundamental representation whereas U(A) is the unitary parameter representing the Lorentz group. This stands for transformations of the vector space that preserve the length of vectors. There are two vectors having zero scalar product in one reference frame which will remain orthogonal in the rotated frame. Remember space-time is itself a fundamental dynamic variable. - page 9 : eq 14: it is not clear to me why it is sufficient to consider the... This means that massless particles are meaningless in Newtonian mechanics because they carry no energy or momentum and cannot sustain any force. Now, the relativistic expression for energy and momentum which is: however allows for non-zero energy-momentum for a massless particle when and this requires |v| 1. This actually wants to say that in order to accommodate the observed properties of the long-range electromagnetic and gravitational interactions, we also need to give the mediator a on-zero spin. However, this is non-trivial. This is an intrinsic requirement in any space-time study dealing with real vector spaces. Here 'P' is the orthogonal parameter that is subject to fundamental representation whereas U(A) is the unitary parameter representing the Lorentz group. This stands for transformations of the vector space that preserve the length of vectors. There are two vectors having zero scalar product in one reference frame which will remain orthogonal in the rotated frame. Remember space-time is itself a fundamental dynamic variable. The irreps corresponding to the massless particles are found using the irreps of the little group for the massless particles and thus this is a better option. This little group is actually isotropy group and is a subgroup of the Poincare. no "internal Yang-Mills index" ^a which in our case transforms under space-time SO(1,3) rather than internal

Introduction of economic scarcity Essay Example | Topics and Well Written Essays - 500 words

Introduction of economic scarcity - Essay Example For example when computers came in and became a household name, if any person is still computer illiterate, won't he or she find that getting a job has become close to impossible. In the same way, if a country has been producing things with old technology for a long time and there comes a new technology that not only creates efficiency but also gives better results, don't you think people will demand the products made by new technology. Then a producer using older technology will go out of demand and his products will become obsolete. This is how scarcity appears as and when a new discovery or invention is made. But it is important that the new technology be very significant and life changing. On the island, they have found that a new invention is likely to revolutionize the way things are done on the island. The problem is should this invention be adopted If yes, then how should this be accomplished Keeping these points in mind, the council must create a plan that would address the key issues knowing that this technology has to be adopted. In order to reduce resistance and make people more open to the acceptance and adoption of this technology, it is critical that they are made aware of the benefits of this technology. When computers came, they were not adopted by everyone in a single day but people came to embrace this new technology as and when they learned o

Identify an issue which you think is important in the British Essay

Identify an issue which you think is important in the British Education system today. In what way can sociology help us understa - Essay Example However, evidence suggests that there exists racial inequality in the UK educational system (DFES, 2005) with the most affected groups being ethnic minority pupils of Black, Irish Travelers and Gypsy/Roma heritages. The evidence shows that pupils from these racial backgrounds perform poorly in schools compared to their counterparts from other ethnic groups, a situation that has long-term implications on their future. Efforts by various stakeholders to find a way of breaking this chain of inequality, educational underachievement and restricted life chances continue to remain a fundamental challenge. Although the UK policymakers and practitioners have come up with wide ranging attempts to alleviate this problem, the desired impact is yet to be achieved. This paper looks at racial inequality in the UK educational system and tries to explain the phenomenon though the lenses of theories of sociology at an attempt to understand the causes. Moreover, the paper outlines evidence that suggest s racial inequality still exists in the educational system

Financial Management and Risk Analysis Assignment

Financial Management and Risk Analysis - Assignment Example The new automated assembly line will be requiring the purchase of five new robots, each costing $32,000 and associated gripping devices costing a total of 65,000. Roller tracking and new assembly fixtures will also be needed adding up to a cost of 15,000. The new assembly cells will be manned by three cell programmers/operators who will be paid 20,000 each. The finance department estimates that installing the automated system will generate an annual cost savings of 5,000 due to the reduction in reduction in scrap and rework. After five years, the robots can be sold each with market value of 1000. This report will analyse the possibility of investment in the new assembly line by utilizing financial management tools. The first section will look at the annual expected cash inflows and outflows. The next will be an analysis of the investment through the use of capital budgeting tools like payback period, return on investment, net present value, discounted payback period, internal rate of return, and sensitivity analysis. Recognizing that numbers don't tell all, this report also goes beyond quantitative analysis by also looking at the quantitative issues which should be considered by the firm. Table 1 shows the expected annual cash flow that our business organization hopes to incur in the installation of the automated assembly line. ... The first to fourth years are forecasted to generate cash inflows of 93,000 annually which reflects the cost savings from rework and scrap and the elimination of the cost incurred in hiring fitters offsetting the salaries of the computer technician. During the fifth year, the company will be incurring the same costs and benefits together with the expected salvage value of the robots. Table 1. Forecasted Cash Flow III. Payback Period The payback method is one of the most popular tools in conducting capital budgeting decision. The payback period tells the company the length of time required to recoup the original investment through investment cash flows. This is essentially the time when the company breaks even-the initial capital outlay is equal to the cash flows. Considering that the business organization invests in a project which generates the same level of cash flow annually, the payback period is computed as the follows: Payback = Initial Investment Annual Cash Flow (equation 1) However, if the investment generates unequal annual cash flows, then the individual annual cash flows are subtracted from the initial investment until a difference of zero is reached (Lightfoot 2003). The year when cash flow equals investment is the payback period. Other things being equal, the investment with a low payback period is chosen as it implies less risk for the company. Table 2. Payback Period Table 2 shows how the pay back period for the proposed automated assembly line. As the investment yields unequal cash flow for the five-year period, this report simply subtracted the yearly cash inflow to the total amount of the investment. The cash outlay for

UNICEF Essay Example | Topics and Well Written Essays - 500 words

UNICEF - Essay Example focuses its programs on: Child Survival and Development; Basic Education and Gender Equality; HIV/ AIDS and Children; Child Protection; and, Policy Advocacy and Partnerships. With the cooperation of its world wide partners and members, including governments and non-government agencies, it is able to implement its programs for children all over the world. This being so, it has 191 country based offices and innumerable chapters. Chapters or groups can be organized with the purpose of furthering the UNICEF goals and primarily act as fund raisers. Generally, there are no requirements for membership. In fact, one can just sign in at the UNICEF Website (www.unicef.org) and become a member. But some chapters require additional requirements to ensure that its members understand the goals of the organization. The University of Pennsylvania for one requires a person to attend five meetings before he is allowed to join their UNICEF Chapter. The University of Houston allows immediate membership provided that one pays the $10.00 annual fee forming part of their fund to be turned over to the UNICEF. Donations for the continued support of UNICEF Programs can be directly sent to any UNICEF Office. Membership is important. It allows you to give donations to help fund UNICEF programs. It also helps in showing support to UNICEF and its programs. Your show of support and being counted as a member gives power to UNICEF and for what it stands for. As a member one can avail of the overflowing gratitude and smiles of children that have benefitted and continue to benefit from UNICEF Programs which you can view at the UNICEF Website. These are far more valuable than money. It brings so much happiness and joy to each member. For me it truly out-weights gold. UNICEF has been engaged in so many successful projects. Out of these so many projects, one that I really appreciate and give support to is the â€Å"Unite for Children, Unite for Aids† program. This program initiated

Physical Environment Essay Example | Topics and Well Written Essays - 3000 words

Physical Environment - Essay Example A child being in his early stage of life and mostly in learning phase is affected by the kind of environment where he spends most of his time, if the physical environment is attractive and nicely presentable then it helps the child in building his confidence and develop a taste for neatness and a systematic approach towards any thing that he comes across. If the physical environment is shabby and not presentable enough, it can have negative impact on child's psychology and can thus invoke negative thoughts in him. It can hinder his overall growth as an individual. So the physical environment in the classroom should be designed appropriately so as to cater to needs of teachers as well as students and should have a fruitful impact on the student's mentality and overall growth. Through observation, description, and reflection on their own and P-12 students' prior experience, learning styles, strengths, and needs, the preliminary candidate recognizes that students differ in their approaches to learning. It was a kindergarten class of 10 studen... Do you think that the physical environment is important to student success Why or why not. Definitely the physical environment is one of the basic ingredients of student's success; it is this physical environment only which helps a student To develop his psychology negative or positive, depending upon the type of physical environment he is having in his class. A child being in his early stage of life and mostly in learning phase is affected by the kind of environment where he spends most of his time, if the physical environment is attractive and nicely presentable then it helps the child in building his confidence and develop a taste for neatness and a systematic approach towards any thing that he comes across. If the physical environment is shabby and not presentable enough, it can have negative impact on child's psychology and can thus invoke negative thoughts in him. It can hinder his overall growth as an individual. So the physical environment in the classroom should be designed appropriately so as to cater to needs of teachers as well as students and should have a fruitful impact on the student's mentality and overall growth. Step 3: Learners Mid-Preparation Benchmark 1.2.2 Human Development Mid-Preparation Benchmark 1.2.3 Through observation, description, and reflection on their own and P-12 students' prior experience, learning styles, strengths, and needs, the preliminary candidate recognizes that students differ in their approaches to learning. Objective Description Give an over-all description of the students in the classroom: number, gender, diversity, culture, race, exceptionalities, special needs, socio-economic status, etc. It was a kindergarten class

Pushed Out and Forgotten †The Batwa Essay Example for Free

Pushed Out and Forgotten – The Batwa Essay Born in the United States, I grew up believing that the children who lived next door or the boy who sat across from me in class had it all. Even as an adult, there are bits of me that occasionally envy the family with the perceived â€Å"perfect life;† church every Sunday, home office with a big window, stain-less carpets, and children with perfect hair. But, I know better. Life in the United States is something I take for granted. I knew this and needed to remind myself just how truly grateful I should be for the life I live in the great states. How do I do this? What do I need to see in order to really understand life outside America? I needed to leave my country and visit a place that has many struggles; where people live humbly. What I didn’t realize was that I would leave the country I chose to visit, wanting to go back and make a difference. Rwanda is rich with many things; culture, diversity, and land. Rwanda has also perfected the art of discrimination. When my plane landed, I could not have grabbed my luggage and left the airport more quickly. I was excited for what the change in culture would bring me. What I would take home to teach my own family and friends. Some were excited to see me and others were less than thrilled to see me traipsing my way through their lands. I did what I could to respect the people and their cultures, as I did my research before coming to Rwanda. The population there is made up of mostly Hutu; traditional farmers. The rest of the population, mostly consist of Tutsi (or warrior people) and the Batwa. Though I would have enjoyed getting to know all the different people and ethnicities of Rwanda, I spent most of my time with the Batwa (Whitelaw, 2007). The history of the Batwa is something that I came to hold close while traveling with some who are conflicted with the fear of the past and the uncertainty of their future. The Batwa were former Central Africa residents  who lived their lives hunting and gathering in the rain forests. Though the lives they lived were not ideal for all, they were happy. But as time went, so was the expectation that they left their homes in order for the rainforest to be used for forestry and conservation. You may say, â€Å"So, were they compensated for the land they had to give up?† Well, no. The Batwa were physically removed from their homes and their land and were never given a red cent to live elsewhere. Kicked out of home, with no money, no good explanation, and expected to build a life in an area unfamiliar to most. The Batwa had no idea what this was going to do to their lives. They knew they did not want to leave but because of their naà ¯ve understanding of the modern world, they would face some struggle ahead. This was a disaster in the making. It didn’t help that many of people, already living in the areas the Batwa were forced to move, did not accept them as people. They were and continue to be discriminated against. The Batwa live in poverty in what is supposed to be a more modern society than what they were founded on. Yet, the population continues to deteriorate. How is this possible? It is possible because they have no land to live on, they eat the farming scraps left after a harvest, they are shunned from the education system because of illiteracy and a lack of money, they are allowed to vote but not allowed to be part of government, and they find it almost impossible to find a job that can support their needs because of discrimination and lack of education (New African, 2010). The Batwa’s situation sounded eerily familiar to me. I equated their situation to the Native American’s situation when the Europeans came to America. Pushed out of their land and forced to live a different way of life in a place that was â€Å"approved† by the rest of the people. I can imagine that the way the Batwa live is similar to the way the Native American’s are forced to live. The difference is that the Native Americans feel forced by lack of education of the rest of Americans, where the Batwa’s are forced because they are still not accepted in today’s Rwandan society. Another big difference I see is that the Batwa are a part of Africa and are being discriminated by their people. Yes, they are a different ethnicity and would live their lives differently, if not forced into another. But, they are still from the same country. After spending time with this  amazing group of people, I have realized that I could not accurately explain the difference between ethnicity and race. Six months ago, I lumped those two terms together. Though they have similarities, they are different. I am a Caucasian, but that doesn’t mean it is easy to assume my ethnicity. My great friend is Caucasian, but that doesn’t mean her and I have the same ethnicity. I was born and raised in a small town out of Minnesota and she was raised in Ireland. The two terms are different. Her family traditions around the holidays are different than mine. Really understanding the differences between race in Rwanda and their ethnicities was important when trying to understand why there is and was so much discrimination. Though the race may be nearly the same, each group of people lived completely different lives. The Batwa’s lived in a rainforest and Hutu’s ran farms in a more modern lifestyle. Even the way each culture enjoys dancing is either accepted or it is not. The Batwa were forced to study Christianity, eat the foods of the modern people, and even had to learn how to wear clothing differently. The way the Batwa chose to live their lives in the rainforest would not be acceptable in the eyes of the rest of Rwanda. Ethnicity and race are different and this is why discrimination exists in Rwanda (New African, 2012). * Learning the history of how the Batwa live, by choice or not, begged the question, â€Å"what has this done to them as a people?† The discrimination of the Batwa and other small groups of people, have made it difficult for them to thrive much less survive. They impact they have on the government is nil, so seeing a dramatic change through government representation is unlikely. There are groups such as the Organization of Rwandan Potters (COPORWA) who consider the Batwa and their situations. The Batwa are value their culture and ways of life, but have lost touch because of highly encouraged religions and lack of acceptance of their culture. The Batwa do and will continue to struggle to be recognized as a minority group who needs help (Ingelaere, B., 2010). * The Batwa have lost their land, they are losing their culture, the people are not surviving, and the idea of maintaining hope is slowly slipping away. Spending time with my new found friends made me want to bring them all home with me. But, as I have learned, moving people from their homes and lives can create more problems than intended. Though, I would see to it that they were treated with the respect they deserve, it does not fix the bigger problem. The  human race has much to learn about what the true meaning of love, life, and respect is. Unfortunately, discrimination and a lack of understanding is a natural course of nature. There are some things out of our control and others in which we can only influence. If I could change anything about my visit to Rwanda, it would have been to spend more time there to understand more about why the other cultures see the Batwa the way they do. Though the discrimination against the Batwa is moving at a snail’s pace in the right direction, at least it is moving that way. Until then, I send my prayers and well wishes to the Batwa people. I would also challenge those of you reading my article to take some time to travel to a place similar to Rwanda to learn about another culture; what it has to offer is far more than money can buy. * References: Batwa A people under threat. (2010). New African, (497), 38. Ingelaere, B. (2010). Peasants, power and ethnicity: A bottom-up perspective on Rwanda’s political transition. African Affairs, 109(435), 273-292. Whitelaw, Kevin. (2007). Rwanda Reborn. U.S. News World Report, 00415537, Vol. 142, Issue 14